nodejs undici up to 5.28.x/6.21.1/7.4.x memory leak

Summaryinfo

A vulnerability was found in nodejs undici up to 5.28.x/6.21.1/7.4.x. It has been rated as problematic. This affects an unknown part. The manipulation leads to memory leak. This vulnerability is listed as CVE-2025-47279. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in nodejs undici up to 5.28.x/6.21.1/7.4.x. It has been rated as problematic. This issue affects an unknown function. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webhook repeatedly, then they can cause a memory leak. This has been patched in versions 5.29.0, 6.21.2, and 7.5.0. As a workaound, avoid calling a webhook repeatedly if the webhook fails.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-47279 since 05/05/2025. The exploitation is known to be difficult. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 238268 (Amazon Linux 2023 : nodejs22, nodejs22-devel, nodejs22-full-i18n (ALAS2023-2025-1009)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.29.0, 6.21.2 or 7.5.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (238268). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• nodejs

Name

• undici

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26
• 5.27
• 5.28
• 6.21.0
• 6.21.1
• 7.0
• 7.1
• 7.2
• 7.3
• 7.4

Website

• Product: https://github.com/nodejs/undici/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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